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Complete product-state contact set and optimality of the canonical three-qubit Shifts witness
For the three-qubit Shifts unextendible product basis (UPB), the minimum product-state expectation value $λ_{\mathrm{Shifts}}=1-3\sqrt6/8$ of the UPB projector is known, and four attaining product states were exhibited previously. We determine the complete equality set over all complex product state
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